环氧沥青固化过程中的粘度特性

Viscosity changes of epoxy bitumen due to curing

针对环氧沥青固化过程中的流变学特性,采用粘度为表征参数,重点研究固化温度、剪切速率以及稀释比对其固化速度的影响。结果表明,温度越高,环氧沥青的固化速度越快;过快的剪切速率会干扰并破坏固化结构的形成;采用基质沥青对环氧沥青进行稀释可以有效控制固化速度并降低材料成本。综合考虑施工和易性等因素,推荐稀释比(环氧沥青:基质沥青)为25∶75,材料拌合速度为20 r/min,材料在拌合、运输及压实过程中温度应保持在130℃,道路施工需在5 h内结束。

In this study,a series of viscosity tests were performed to investigate various conditions,i.e.temperature,shear rate and dilution level,on the curing behavior of epoxy bitumen.The results show that curing rate of epoxy bitumen increased with temperature;high shear rate would interfere the formation of crosslinks in epoxy bitumen,resulting in a negative effect on curing rate;diluting epoxy bitumen by a base bitumen was an effective way to control the curing rate and reduce the material cost.Considering the workability and durability of paving materials,it is recommended that dilution level of epoxy bitumen is 25%,mixing rate is 20 r/min,curing temperature is 130℃,and the pavement construction should be finished within 5 hours.